Footage shot in 60i to be slowed down and view on internet at DVinfo.net

Go Back   DV Info Net > High Definition Video Acquisition > General HD (720 / 1080) Acquisition

General HD (720 / 1080) Acquisition
Topics about HD production.


Reply
 
Thread Tools Search this Thread
Old August 22nd, 2008, 04:41 AM   #1
Regular Crew
 
Join Date: Sep 2005
Location: Southampton UK
Posts: 165
Footage shot in 60i to be slowed down and view on internet

Hi,

I have many clips shot in 60i which I would like to slow down and then distribute on the internet.

I have been told that I should convert it to progressive and then use a plug-in like Twixtor.

What is an easy way of converting 60i into progressive?

I am using FCP Studio 2.

Thanks.
Brendan Pyatt is offline   Reply With Quote
Old August 22nd, 2008, 04:50 AM   #2
Inner Circle
 
Join Date: Feb 2004
Location: switzerland
Posts: 2,131
if your plan is to use full size video, you need to deinterlace.
if you will display smaller size, the easiest way is to keep only on frame (dividing video height by 2).
if the size is neither full size nor half size but in between, you have to deinterlace first, then resize.
Giroud Francois is offline   Reply With Quote
Old August 22nd, 2008, 05:07 AM   #3
Regular Crew
 
Join Date: Sep 2005
Location: Southampton UK
Posts: 165
Quote:
Originally Posted by Giroud Francois View Post
if you will display smaller size, the easiest way is to keep only on frame (dividing video height by 2).
i think it will be smaller than half size - around the size of a youtube video window.

what do you mean by 'keep only on frame'

whats the best way to de-interlace?

there seems to be quite a few tools for doing this - can I do it in FCP or is the a better easier way?

Furthermore, how do tools like like Twixtor help with slo-mo?
Brendan Pyatt is offline   Reply With Quote
Old August 22nd, 2008, 08:36 AM   #4
Inner Circle
 
Join Date: Feb 2004
Location: switzerland
Posts: 2,131
if it is smaller than half size, you do not need to deinterlace.
first make it half size, then resize smaller.
Usually when you make a video half size , the computer simply discard one frame, so you get it "deinterlaced"
Giroud Francois is offline   Reply With Quote
Old August 22nd, 2008, 02:03 PM   #5
Regular Crew
 
Join Date: Sep 2005
Location: Southampton UK
Posts: 165
thanks!

I am not sure i really understand this though....

I thought progressive was a full frame and interlaced a half frame (alternate lines).

My understanding was that to get a decent picture on the internet - to be view on computer screens a progressive image was better as tv de-interlace and computer screens don't.
Brendan Pyatt is offline   Reply With Quote
Old August 22nd, 2008, 04:46 PM   #6
Inner Circle
 
Join Date: Feb 2004
Location: switzerland
Posts: 2,131
interlaced picture creates a problem because 2 frames of an interlaced picture are not taken at the same time.
So if the subject is not moving, the lines (even and odd) stack fine and you will not see any trouble with the picture.
if the subject is moving fast , you can imagine that a frame contains a totally different picture than the next frame (at one frame subject can be at left, and in the next frame subject moved to the right . When you mix them to rebuild the picture, you see the problem.
progressive screens are displaying both frames at the same time, so they shows this "interlaced artifact".
TV screens are sending one frame, then the other one, so you do not see the problem.

When resizing video the process is the same, picture is first rebuild, then pixel are resampled to the target size. If picture is interlaced, you could get 3 lines from a frame, then 3 lines from the other frame. when rebuilding the picture, the artifact is there.

dividing a picture by 2 is the only case when resizing is ok for interlaced picture.
because taking one line on two is the same than discarding one frame.
Giroud Francois is offline   Reply
Reply

DV Info Net refers all where-to-buy and where-to-rent questions exclusively to these trusted full line dealers and rental houses...

Professional Video
(800) 833-4801
Portland, OR

B&H Photo Video
(866) 521-7381
New York, NY

Z.G.C.
(973) 335-4460
Mountain Lakes, NJ

Abel Cine Tech
(888) 700-4416
N.Y. NY & L.A. CA

Precision Camera
(800) 677-1023
Austin, TX

DV Info Net also encourages you to support local businesses and buy from an authorized dealer in your neighborhood.
  You are here: DV Info Net > High Definition Video Acquisition > General HD (720 / 1080) Acquisition

Thread Tools Search this Thread
Search this Thread:

Advanced Search

 



Google
 

All times are GMT -6. The time now is 02:55 AM.


DV Info Net -- Real Names, Real People, Real Info!
1998-2017 The Digital Video Information Network